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  ON Semiconductor Electronic Components Datasheet  

PCS3P2042B Datasheet

LCD Panel EMI Reduction IC

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PCS3P2042B
LCD Panel EMI Reduction IC
Features
FCC approved method of EMI attenuation.
Provides up to 15dB of EMI suppression.
Generates a low EMI spread spectrum clock of the
input frequency.
Input frequency range: 30MHz - 110MHz.
Output frequency range: 30MHz - 110MHz
Optimized for 32.5MHz, 54MHz, 65MHz, 74MHz and
108MHz pixel clock frequencies.
Internal loop filter minimizes external components and
board space.
Eight selectable high spread ranges up to ±2%.
Selectable spread options: Down Spread and Center
Spread
SSON# control pin for spread spectrum enable and
disable options.
Low cycle-to-cycle jitter.
3.3V ± 0.3V operating range.
CMOS design.
Supports most mobile graphic accelerator and LCD
timing controller specifications.
Available in 8-pin TSSOP Package.
Product Description
The PCS3P2042B is a versatile swprweawd.DastpaeSchteruemt4U.com
frequency modulator designed specifically for digital flat
panel applications. The PCS3P2042B reduces
electromagnetic interference (EMI) at the clock source,
allowing system wide reduction of EMI of down stream
clock and data dependent signals. The PCS3P2042B
allows significant system cost savings by reducing the
number of circuit board layers ferrite beads, shielding and
other passive components that are traditionally required to
pass EMI regulations.
The PCS3P2042B uses the most efficient and optimized
modulation profile approved by the FCC and is
implemented in a proprietary all digital method.
The PCS3P2042B modulates the output of a single PLL in
order to “spread” the bandwidth of a synthesized clock,
and more importantly, decreases the peak amplitudes of
its harmonics. This results in significantly lower system
EMI compared to the typical narrow band signal produced
by oscillators and most frequency generators. Lowering
EMI by increasing a signal’s bandwidth is called ‘spread
spectrum clock generation.’
Applications
The PCS3P2042B is targeted towards digital flat panel
applications for notebook PCs, palm-size PCs, office
automation equipments and LCD monitors.
Block Diagram
SR0 CP1 CP0 SSON#
VDD
CLKIN
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
PLL
VCO
Output
Divider
ModOUT
©2010 SCILLC. All rights reserved.
JANUARY 2010 – Rev. 2
VSS
Publication Order Number:
PCS3P2042/D


  ON Semiconductor Electronic Components Datasheet  

PCS3P2042B Datasheet

LCD Panel EMI Reduction IC

No Preview Available !

Pin Configuration
PCS3P2042B
CLKIN 1
8 VDD
CP0 2
CP1 3
PCS3P2042B
7 SR0
6 ModOUT
VSS 4
5 SSON#
www.DataSheet4U.com
Pin Description
Pin# Pin Name
1 CLKIN
2 CP0
3 CP1
4 VSS
5 SSON#
6 ModOUT
7 SR0
8 VDD
Type
I
I
I
P
I
O
I
P
Description
External reference frequency input. Connect to externally generated reference signal.
Digital logic input used to select Spreading Range. This pin has an internal pull-up
resistor. Refer to Modulation Selection Table.
Digital logic input used to select Spreading Range. This pin has an internal pull-up
resistor. Refer to Modulation Selection Table.
Ground to entire chip. Connect to system ground.
Digital logic input used to enable Spread Spectrum function (Active LOW). Spread
Spectrum function enabled when LOW, disabled when HIGH.
This pin has an internal pull-low resistor.
Spread spectrum clock output.
Digital logic input used to select Spreading Range. This pin has an internal pull-up
resistor. Refer to Modulation Selection Table.
Power supply for the entire chip.
Modulation Selection
CP0 CP1 SR0
000
001
010
011
100
101
110
111
32.5MHz
1.75
1.89
1.39
2.1
0.74
1.1
0.32
0.58
Spreading Range (± %)
54MHz
1.53
1.7
1.2
1.85
0.6
0.93
0.3
0.5
65MHz
1.41
1.55
1.1
1.7
0.57
0.86
0.28
0.45
81MHz
1.27
1.4
1.0
1.55
0.52
0.77
0.26
0.4
108MHz
1.1
1.2
0.9
1.35
0.45
0.68
0.23
0.36
Modulation Rate
(KHz)
(FIN /40) * 62.89
KHz
Rev. 2 | Page 2 of 7 | www.onsemi.com


Part Number PCS3P2042B
Description LCD Panel EMI Reduction IC
Maker ON Semiconductor
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